Don't corrupt the environment when setting up StorageTestCase.
Don't corrupt the environment when setting up StorageTestCase.

Also adds some necessary patching to PartitionDevice related to resize
so that it does not require setting up a mocked parted.Geometry.

vojtechtrefny/blivet,vojtechtrefny/blivet,AdamWill/blivet,jkonecny12/blivet,vpodzime/blivet,dwlehman/blivet,vpodzime/blivet,rhinstaller/blivet,rvykydal/blivet,rhinstaller/blivet,jkonecny12/blivet,AdamWill/blivet,dwlehman/blivet,rvykydal/blivet